Quarter	Billions of US Dollars
1993-07-01	9.230
1993-10-01	9.602
1994-01-01	10.976
1994-04-01	12.317
1994-07-01	13.984
1994-10-01	15.146
1995-01-01	13.990
1995-04-01	15.846
1995-07-01	19.018
1995-10-01	19.805
1996-01-01	19.801
1996-04-01	23.712
1996-07-01	18.101
1996-10-01	23.786
1997-01-01	23.844
1997-04-01	24.527
1997-07-01	25.764
1997-10-01	22.630
1998-01-01	25.772
1998-04-01	26.917
1998-07-01	26.163
1998-10-01	25.058
1999-01-01	23.229
1999-04-01	25.466
1999-07-01	29.242
1999-10-01	28.478
2000-01-01	29.908
2000-04-01	27.140
2000-07-01	25.298
2000-10-01	26.835
2001-01-01	27.176
2001-04-01	28.668
2001-07-01	26.341
2001-10-01	27.840
2002-01-01	23.448
2002-04-01	22.460
2002-07-01	19.917
2002-10-01	22.062
2003-01-01	27.611
2003-04-01	28.900
2003-07-01	32.257
2003-10-01	32.340
2004-01-01	30.045
2004-04-01	30.824
2004-07-01	30.411
2004-10-01	32.089
2005-01-01	31.213
2005-04-01	30.353
2005-07-01	27.773
2005-10-01	29.705
2006-01-01	35.570
2006-04-01	38.209
2006-07-01	48.981
2006-10-01	53.382
2007-01-01	61.764
2007-04-01	65.133
2007-07-01	59.008
2007-10-01	62.235
2008-01-01	72.353
2008-04-01	77.662
2008-07-01	77.553
2008-10-01	76.276
2009-01-01	75.324
2009-04-01	90.200
2009-07-01	96.387
2009-10-01	92.470
2010-01-01	83.630
2010-04-01	80.029
2010-07-01	86.959
2010-10-01	84.901
2011-01-01	98.838
2011-04-01	106.485
2011-07-01	101.610
2011-10-01	113.198
2012-01-01	122.642
2012-04-01	122.128
2012-07-01	130.781
2012-10-01	136.620
2013-01-01	153.477
2013-04-01	171.947
2013-07-01	193.290
2013-10-01	201.386
2014-01-01	227.815
2014-04-01	231.177
2014-07-01	240.550
2014-10-01	255.662
2015-01-01	249.854
2015-04-01	263.265